Influence of valve governing mode on solid particle erosion and efficiency in governing stage of steam turbine

Li-hua Cao, Shuang Liu, Yan-chao Li and He-yong Si

Energy, 2020, vol. 191, issue C

Abstract: Solid particle erosion (SPE) in governing stage is one of the concerns for large capacity steam turbine. Based on Euler-Lagrange method and Finnie erosion model, the influence of valve governing mode on SPE and efficiency of governing stage were numerically investigated. Results show that the erosion rate density of different circumferential nozzles changes greatly, and the erosion rate density of the most serious erosion nozzle is about 4 × 103 times that of the lightest erosion nozzle. The max erosion rate density of nozzle under sequential valve governing mode (SEVGM) is higher than that under single valve governing mode (SIVGM), in which the particle impact velocity plays a decisive role. With the increase of roughness, the governing stage efficiency decreases under two types of valve governing modes. Moreover, the governing stage efficiency under SEVGM decreases more obviously than that under SIVGM.

Keywords: Governing stage; Solid particle erosion; Valve governing mode; Roughness; Stage efficiency (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:191:y:2020:i:c:s0360544219322765

DOI: 10.1016/j.energy.2019.116581

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